Classifications

• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
  • C09J161/00—Adhesives based on condensation polymers of aldehydes or ketones; Adhesives based on derivatives of such polymers
  • C09J161/04—Condensation polymers of aldehydes or ketones with phenols only
  • C09J161/06—Condensation polymers of aldehydes or ketones with phenols only of aldehydes with phenols
  • C09J161/14—Modified phenol-aldehyde condensates
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G16/00—Condensation polymers of aldehydes or ketones with monomers not provided for in the groups C08G4/00 - C08G14/00
  • C08G16/02—Condensation polymers of aldehydes or ketones with monomers not provided for in the groups C08G4/00 - C08G14/00 of aldehydes
  • C08G16/0293—Condensation polymers of aldehydes or ketones with monomers not provided for in the groups C08G4/00 - C08G14/00 of aldehydes with natural products, oils, bitumens, residues
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G8/00—Condensation polymers of aldehydes or ketones with phenols only
  • C08G8/28—Chemically modified polycondensates
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L97/00—Compositions of lignin-containing materials
  • C08L97/02—Lignocellulosic material, e.g. wood, straw or bagasse

Definitions

• This invention relates to modified phenol-formaldehyde resins, and to methods of their preparation.
• it relates to methods of incorporating into a phenol-formaldehyde resin waste materials resulting from paper making procedures, together with an alkali ferricyanide, and to the modified resin thus obtained.
• replacement does not mean the incorporation of an inert, or relatively inert, diluent for the phenol. What is sought is a replacement substance which will take part in the chemistry of either the resin-making process or, where applicable, the resin curing process or even in both resin making and curing. These restrictions severly limit the number of possible substances that can be considered as potential replacement substances for phenol in phenol-formaldehyde resin systems.
• All paper-making processes which employ a cellulosic material feed include as an early step a procedure whereby the cellulosic feed, such as wood, straw or bagasse is reduced to a fibrous mass. That pulp preparation step also produces as a by-product an aqueous complex mixture of organic materials.
• the water-insoluble part of this mixture is generally removed by a suitable procedure.
• the remainder of the mixture comprising a complex solution in water (which is to be taken as including both emulsions and colloidal suspensions), is generally treated to remove at least some of the water and then discarded. Disposal of this material presents a very difficult pollution problem.
• the water is removed to provide an aqueous material containing about 50% to 55% of organic substances: that is, to a solids content of about 50% to 55%, by weight.
• the third disadvantage is that the lignin-based material is used merely as an inert extender, and is not expected or even wanted to take part in the resin chemistry: as a consequence at least some impairment of the resin properties must result from the dilution.
• a second method studied has been to add a fourth substance to the system, to act as a catalyst, or co-catalyst if added to the resin making process, which will persuade the lignin sulphonate to enter into reaction either with the resin, or with some of the resin reactants.
• U.S. Pat. No. 2,227,219 (issued Dec. 31, 1940 to General Electric Company) describes a resin making procedure in which ammonia or an amine are added sometime after the resin making reaction has been commenced;
• U.S. Pat. No. 3,886,101 proposes to pre-react a lignin sulfonate with an aldehyde or epoxide;
• U.S. Pat. No. 3,931,070 issued Jan. 6, 1976 to Georgia-Pacific proposes to incorporate a trialkyl phosphate into the resin mixture.
• Black liquor, or spent sulfite liquor, as made in a mill is not a simple substance. It is a very complex mixture of substances, and is of variable composition.
• the composition generally will vary due to the inherent variability of the wood being processed. It varies significantly if there is a change in the species being pulped. The composition will also vary as a consequence of any changes in the pulping procedure made to affect the quality of the desired paper product. It is a common experience that this variability in the black liquor is also reflected in any resin glues prepared using it.
• this invention provides a process for the preparation of a lignin sulphonate-modified phenol-formaldehyde resin which comprises together phenol, formaldehyde, potassium ferricyanide, lignosulphonate, and an alkali or alkali earth basic catalyst in the following ratios:
• phenol/lignin sulfonate from 1:0.1 to 1:0.5 as lignin sulphonate solids, or from 1:0.2 to 1:1.0 as black liquor, on a weight ratio basis, provided that irrespective of the sequence in which the reactants are mixed, the potassium ferricyanide is added either with or before the phenol, the reaction being continued until the desired viscosity is reached.
• the phenol/formaldehyde ratio is 1:2.2 on a molar basis.
• the phenol/catalyst ratio is 1:0.25 on a molar basis; the catalyst of choice is sodium hydroxide.
• the phenol/lignin sulfonate solids ratio is in the range of from about 1:0.35 to about 1:0.45 by weight, which is equivalent to a phenol/black liquor ratio of 1:0.67 to 1:0.83 by weight approximately.
• the phenol/potassium ferricyanide ratio is from 50:1 to 25:1 on a weight basis.
• the catalyst of choice is sodium hydroxide.
• the other alkali and alkali earth bases can also be used, for example potassium, calcium and barium hydroxides.
• Another commonly used basic catalyst for preparing resole resins is ammonia, or ammonium hydroxide. In this process ammonia, and ammonium hydroxide, should be avoided.
• ammonia, and ammonium hydroxide should be avoided.
• the minimum pH value for stability appears to be at around pH 9; the use of ammonia or ammonium hydroxide can result in lower pH values than this in the resin reaction mass. At pH values below about 9, destabilization of the black liquor can occur and cause significant problems in the resin making process.
• phenol can include not only pure and technical grade phenol, but also cresols with a high meta- or para-cresol content.
• the preferred phenol composition is one with a boiling range of 180°-200° C., and containing not more than 15% by weight or ortho-cresol plus xylenols.
• the formaldehyde can be used in any of the commercially available forms containing from 37% to 100% formaldehyde, such as aqueous solutions, paraformaldehyde, etc.
• An aqueous formaldehyde solution is preferred. It is also to be noted that in view of the comments above concerning the use of ammonia or ammonium hydroxide as the catalyst, the use of hexamethylene tetramine as a formaldehyde source should be avoided.
• the lignin sulfonate material used in this process can be in any convenient form. The most convenient and the cheapest is to use it straight from a paper or board mill, particularly kraft black liquor. Modified lignosulfonates can also be used as can also lignin sulfonate compositions obtained by concentrating black liquors to remove the water therein, including dry lignin sulfonate solids obtained by this route.
• the only property of the material which needs to be established is its solids content in order to ensure that a proper phenol/lignin sulfonate solids weight ratio is obtained. It also appears that the source of the lignin sulfonate material is not very important. Unlike other earlier described processes, this invention appears to be relatively insensitive to changes in the liquor used.
• the resin preparation reaction is carried out under essentially conventional conditions. Due to the presence of the lignin sulfonate, some modifications in this conventional process are possible. It is not necessary to add all of the lignin sulfonate at the beginning; up to half can be added initially and the remainder as the reaction goes along. Alternatively, all of the lignin sulfonate can be allowed to pre-react with the formaldehyde, before addition of the remaining reactants. However, there is one essential requirement that must be observed if a satisfactory resin is to be obtained.
• the potassium ferricyanide must be present when the phenol is added. Thus the potassium ferricyanide preferably is added immediately before, or with, the phenol. Why this should be necessary is not clearly understood. There is some indication that the potassium ferricyanide modifies, in some way, the lignin sulfonate-phenol interaction.
• the resin reaction system can also contain the conventional additives, such as foam suppressants.
• the amount of water used is also a matter of convenience. Where a liquid resin is prepared, it can be diluted with water to a desired solids content. Where a solid resin is required, this can be obtained by the usual concentration and water removal techniques to provide a solid, as flakes, lumps, or powder. These resins are also suitable for spray drying to obtain a free flowing powder, and this is the preferred method for obtaining a dry powder resin.
• the resin reaction conditions used are generally conventional, the time and temperature profiles and manner of catalyst addition being selected to fit the type of resin desired.
• a viscosity measurement generally is used to determine when the reaction has reached the desired level of polymerization. Consequently many of the useful features of resin preparation procedures which are known to affect final resin properties can be used here.
• a number of variations are given for resin preparation both as regards reactant ratios, addition sequences and temperature profiles.
• the letter viscosities given are Gardner-Holt. Percentages, unless otherwise identified, are by weight.
• the various board properties mentioned were all measured by standard testing techniques.
• the resin and ESSO 1728* wax were mixed with wood wafers (2.5% resin, 1.5% wax) and waferboards were pressed at 204° C. and 3375 kPa pressure for 4 minutes and 5 minutes.
• the boards obtained had the following characteristics when tested according to the CSA (Canadian Standards Association) specifications.
• Waferboards made from this resin in the same way as in Example 1 had the following properties.
• X indicates held at specified temperature until specified viscosity reached.
• the moles formaldehyde and catalyst are per mole phenol; the BL figure is a weight ratio per 1 part of phenol (i.e. a figure of 0.67 indicates 0.67 parts BL to 1 part P by weight); and the CN figure is percent by weight of the phenol.
• ⁇ Post NaOH ⁇ indicates that an addition of sodium hydroxide was made at 35° C. after the reaction was completed; the figure given is moles NaOH added per mole phenol used in the preceeding reaction.
• Table 1B this is the main variable, as four different batches are used, one for each of the following groups: Experiment 16-19; 20-22; 23, 24; 25.

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• Chemical & Material Sciences (AREA)
• Organic Chemistry (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Health & Medical Sciences (AREA)
• Medicinal Chemistry (AREA)
• Polymers & Plastics (AREA)
• Engineering & Computer Science (AREA)
• General Chemical & Material Sciences (AREA)
• Oil, Petroleum & Natural Gas (AREA)
• Life Sciences & Earth Sciences (AREA)
• Wood Science & Technology (AREA)
• Materials Engineering (AREA)
• Phenolic Resins Or Amino Resins (AREA)
• Adhesives Or Adhesive Processes (AREA)

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Cited By (16)

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Citations (13)

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• 1984
  • 1984-08-28 US US06/644,949 patent/US4537941A/en not_active Expired - Fee Related
• 1985
  • 1985-06-13 CA CA000483878A patent/CA1224295A/en not_active Expired
  • 1985-07-23 NO NO852923A patent/NO852923L/no unknown
  • 1985-07-25 AU AU45536/85A patent/AU4553685A/en not_active Abandoned
  • 1985-07-30 BR BR8503619A patent/BR8503619A/pt unknown
  • 1985-07-30 FI FI852944A patent/FI852944L/fi not_active Application Discontinuation
  • 1985-07-30 DK DK345785A patent/DK345785A/da not_active Application Discontinuation
  • 1985-07-31 EP EP85305466A patent/EP0173469A1/en not_active Withdrawn
  • 1985-07-31 JP JP60169661A patent/JPS6164708A/ja active Pending

Patent Citations (13)

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